171121705 has 16 divisors (see below), whose sum is σ = 213663744. Its totient is φ = 131423040.

The previous prime is 171121693. The next prime is 171121723. The reversal of 171121705 is 507121171.

It is not a de Polignac number, because 171121705 - 2⁹ = 171121193 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 171121705.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15339 + ... + 24031.

It is an arithmetic number, because the mean of its divisors is an integer number (13353984).

Almost surely, 2^171121705 is an apocalyptic number.

It is an amenable number.

171121705 is a deficient number, since it is larger than the sum of its proper divisors (42542039).

171121705 is a wasteful number, since it uses less digits than its factorization.

171121705 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8856.

The product of its (nonzero) digits is 490, while the sum is 25.

The square root of 171121705 is about 13081.3495098938. The cubic root of 171121705 is about 555.1815600561.

Adding to 171121705 its reverse (507121171), we get a palindrome (678242876).

The spelling of 171121705 in words is "one hundred seventy-one million, one hundred twenty-one thousand, seven hundred five".